TeamViewer will eventually use 443/TCP and 80/TCP, so you'll need to block by IP address or FQDN.

Due to the large IP/domain space used by TeamViewer, this may be an arduous process of monitoring its outbound connection attempts over time. Use TCPView on a local Windows host to easily monitor connection attempts. Of course if you're comfortable with WireShark you can filter these ports and log attempts over time.

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